Science

Biology A Semester Exam

1.Nucleotides contain sugar, a phosphate group, and a nitrogen base. Which of the following is a nitrogen base?
-guanine

2.The following list includes several examples of chemical groups commonly found in biomolecules:
- 2 and 3

3.Identify the statement below that is true about chemical reactions.
- Exothermic reactions tend to release heat energy to the surrounding environment.

4.You find a blog post written by a student on a university website about photosynthesis. Assess the reliability of this source.
-It may be reliable because they cited multiple high-quality studies from scientific journals.

5.The movement of water across cellular membranes through aquaporins is known as?
-osmosis

6.Distinguish between smooth endoplasmic reticulum and rough endoplasmic reticulum.
-Rough endoplasmic reticulum has ribosomes attached to its surface.

7.When comparing plant cells to animal cells, which organelle is only present in plant cells?
-cell wall

8.Invertebrates lack which organ system?
- skeletal

9.The function of the enzyme salivary amylase is to
-break down starch.

10.Based on the above passage, identify the two body systems that interact together to achieve the described behavior.
-respiratory and circulatory

11.Identify the location within a plant cell where the light-dependent reactions of photosynthesis take place.
-the thylakoid membrane of the chloroplast

12.Compare 41 Calories to 410 kcal (1 kcal = 1,000 calories).
-41 Calories is less than 410 kcal

13.Identify the byproduct of lactic acid fermentation.
-lactic acid

14.The energy in ATP is stored in the chemical bond to a(n)
-phosphate group.

15.The mutation shown in the sequence below can be categorized as which type?
-deletion mutation

16.A tall, heterozygous pea plant is cross-pollinated with another tall, heterozygous pea plant. Use a Punnett square to determine the probability that the offspring is a tall, homozygous pea plant.
-25%

17.Distinguish between the lytic and lysogenic cycles of viruses.
-The viral genome incorporates into the host genome during the lysogenic cycle.

18.Why are common cold viruses difficult to cure?
-The viral genome mutates very quickly.

19.Identify the answer choice that correctly orders the types of cells from least to most differentiated.
-totipotent stem cells β†’ pluripotent stem cells β†’ multipotent stem cells β†’ neuron

20.Identify the phases of mitosis during which sister chromatids are no longer attached by a centromere.
-anaphase and telophase

Hope this helps!

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  1. 21 The cells in your body often look different and perform different functions, but they all have the same
    -DNA

    22 You need to prepare for an exam on mitosis. You search for models of mitosis to help you. What kind of model should you choose?
    - a model that illustrates how a cell divides into two identical cells

    23 The following list of events happens during meiosis:

    Prophase I: Crossing over between homologous chromosomes occurs.
    Metaphase I: Tetrads line up at the metaphase plate.
    Anaphase I: Tetrads are separated.
    Telophase I: Nuclear envelopes reform around the separated chromosomes.
    Prophase II: Chromosomes condense.
    Metaphase II: Chromosomes line up at metaphase plate.
    Anaphase II: Sister chromatids separate into daughter chromosomes.
    Telophase II: Nuclear envelopes reform around the daughter chromosomes.
    Identify the answer choice that correctly lists the events from above that lead to new genetic combinations in the gametes.
    -5,6, and 7

    24 Identify the mutation below that would be passed on to a living, fertile offspring if it happened in a parent.
    -an insertion mutation in an egg cell that deactivates a gene for hair color resulting in a viable error

    25 Methylation is an example of
    -epigenetics

    26 A scientist observes a population of cheetahs on the plains in southern Africa and noticed that cheetahs have very little genetic variation. The scientists claims that the cheetahs are susceptible to extinction as a result of climate change. What is the name of the effect the scientist observed and why is it a concern?
    -Bottleneck effect because it means most cheetahs could succumb to the same environmental stresses

    27 Identify the scenario that could potentially result in new combinations of DNA in the offspring of the individual.
    - a pair of homologous chromosomes fails to separate during anaphase 1 of meiosis

    28 Body size in mice (length from nose to base of tail) is controlled in part by genetics. The following data shows the number of mice grouped by lengths:

    Length Group Number of Mice
    Very small (4-5 cm) 2
    Small (5-7 cm) 6
    Average (7-10 cm) 15
    Large (10-12 cm) 7
    Very large (12-13 cm) 1
    Based on this data and your knowledge of inheritance patterns, identify the inheritance pattern that this trait follows in mice.
    -complete dominance

    this is what i got for the answers (sorry if I'm wrong)

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  2. 23 and 28 are Incorrect but otherwise its 26/28

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  3. 23 is 1 and 2
    28 is polygenic

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  4. it is 100% correct if you use all of their answers and change #23 to "1 and 2"
    and change #28 to "polygenic"
    tysm people

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  5. Everyone is correct 100% :)

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  6. I got a 100% - be sure to change 23/28

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  7. i have different questions for 13,16,17, and 21

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  8. 13. under anaerobic conditions what is the purpose of the lactic acid fermentation in the process of producing ATP?

    16. blood type in humans follows a multiple allele inheritance pattern…

    17. viruses that infect animals tend to be enveloped viruses identified the answer choice that best describes the structure of these viruses

    21. differentiated cells in a multi cellular organism tend to behave differently from stem cells the process of differentiation alters the behavior of cells by

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  9. Thank yall so much life savers out here

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  10. Thanks sooo muchhh

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  11. Anyone have the honors one..?

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  12. I LOVE YOU

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  13. I have a completely different test starting from number 8 😭

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  14. apparently I still have some of the same questions but out of order and only 24 questions in total

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  15. same jas......................

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  16. For the people who have a different test most of the questions are still here just look up the few that aren't

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  17. @jas yea same, number 9 for me is "Distinguish between the lytic and lysogenic cycles of viruses."

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  18. and number 8 was diff too

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  19. Everyone is telling the truth if you have the same questions πŸ™‚

    Thank you so much for the help

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  20. homework helper is correct, for honor students, I think there are different questions I didn't get all of them right but ill put the correct answers. I got a 19/24

    8. The coat that surrounds the genetic material of a virus is made of what material?
    Answer: Protein

    9. Distinguish between the lytic and lysogenic cycles of viruses.
    Answer: The viral genome incorporates into the host genome during the lysogenic cycle.

    13. Which body system receives a stimulus from the environment, processes it, and produces an appropriate response?
    Answer: Nervous

    17. Under anaerobic conditions, what is the purpose of lactic acid fermentation in the process of producing ATP?
    Answer: To generate the NAD+ needed for glycolysis to extract energy from glucose

    20. A mother with type A blood has a son with type O blood. Identify the genotype that the father must have in order to produce this child.
    Answer: IAIB

    22. Which characteristic is shared by telophase and anaphase?
    Answer: The sister chromatids are separate

    23. Differentiated cells in a multicellular organism tend to behave differently from stem cells. The process of differentiation alters the behavior of cells by
    Answer: changing the expression of genes.

    Here you go babes :)

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  21. do u guys go to connexus

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  22. The fact that there's a timer on for my biology check ins, unit tests and now my semester exam. If anyone did the exam now in 2022 are there any essays and how many questions are there? Because if I open it when I'm not ready the timer will start and I'm screwed.

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  23. 25/28
    17 wrong The viral genome incorporates into the host genome during the lysogenic cycle.
    23 wrong 1 and 2
    28 wrong polygenic
    otherwise perfect

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  24. connexus me

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  25. @nova your the best

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  26. OMG THANK U SM <333

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  27. it changed

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  28. and someone answer bob hes the correct one

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  29. bruh, I hate biology .-.

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