Why are inferences a vital part of the scientific process? (1 point)
they are conclusions based on facts
they are facts and patterns that are studied
they are foundations for hypotheses
they are the data that supports a claim
Which option best describes a scientific consensus? (1 point)
an observation made by a scientist that is supported by experimentation and investigation
a general agreement among many a few scientists that is supported by a experimentation and investigation
an observation made by a scientist that is supported by evidence and reasoning
Nucleotides contain sugar, a phosphate group, and a nitrogen base. Which of the following is a nitrogen base? ( 1 point)
tyrosine
ribose
deoxyribose
guanine
Please help I’m a little confused btw i’m in 10th grade Connexus
It’s a Biology A semester exam I have 35 questions if anyone can help me please do :)
The correct answer is guanine.
Why are inferences a vital part of the scientific process?
they are conclusions based on facts
Which option best describes a scientific consensus?
a general agreement among many scientists that is supported by evidence and reasoning
Nucleotides contain sugar, a phosphate group, and a nitrogen base. Which of the following is a nitrogen base?
guanine
What are the chemical subunits that make up proteins?
amino acids
Identify the statement below that is true about chemical reactions.
Exothermic reactions tend to release heat energy to the surrounding environment.
How is “lock and key” used to describe the action of enzymes?
Enzymes have a shape that specifically fits the reactants, like a key in a lock.
The movement of water, containing no solute, across semi-permeable cellular membranes through aquaporins is known as?
osmosis
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 environmental stresses affecting one cheetah could affect them all
Compare 41 Calories to 410 kcal (1 kcal = 1,000 calories).
41 Calories is less than 410 kcal
Identify the byproduct of lactic acid fermentation.
lactic acid
The energy in ATP is stored in the chemical bond to a(n)
phosphate group
Use the paragraph to answer the question.
The condition phenylketonuria, or PKU, is caused by the toxic buildup of the amino acid phenylalanine, which is found in all proteins and even some artificial sweeteners. The build up in the blood affects nerve and brain development. PKU is caused by a mutation in a gene that affects the breakdown of phenylalanine. When foods that contain phenylalanine are removed from the diet, the effects of PKU are reduced.
Which statement is true about expressed traits of PKU and environmental factors?
Nerve and mental problems are a trait in PKU patients caused by the environmental factor of eating phenylalanine foods.
How are pluripotent and multipotent cells different?
A multipotent cell can become many different types of specialized cell within a tissue or organ, but it is more limited than a pluripotent cell.
In a moth population, 48 are brown, 30 are yellow, and 67 are black. What is the approximate probability of a moth being brown and yellow, respectively? (Round your answers)
33%; 21%
Pea pods exist in the same colors as pea seeds, yellow and green. However, unlike pea seeds, green is dominant and yellow is recessive. Two pea plants both have one dominant and one recessive allele for pod color. Which choice correctly states what ratio of the offspring would be from a mating of the two plants?
One quarter of the plants would have yellow pods, and three quarters would have green pods.
Scientists have been tracking the distribution of genetic variations within an elephant population over a period of 15 years. These variations alone can be used as evidence of
different reproductive success.
Identify the answer choice that correctly orders the types of cells from LEAST to MOST differentiated.
totipotent stem cells → pluripotent stem cells → multipotent stem cells → neuron
How are chromosomes passed down to offspring in sexually reproducing organisms?
Chromosomes come in pairs, one from each parent, that code for the same trait.
Differentiated cells in a multicellular organism tend to behave differently from stem cells. The process of differentiation alters the behavior of cells by
changing the expression of genes
Which of the following is a reason why mitosis is a longer process in eukaryotes over prokaryotes?
Checkpoints are designed to detect if there is any damage to DNA.
^^ ALL 100% FOR BIOLOGY A SEMESTER EXAM if youre in honors!! i can confirm cuz i just took it
What is the similarity between a prokaryotic and a eukaryotic cell?
Both prokaryotic and eukaryotic cells are filled with cytoplasm.
When comparing plant cells to animal cells, which organelle is only present in plant cells?
cell wall
Which category of macromolecules provides the energy used directly in cells?
carbohydrates
How is energy stored in ATP?
ADP is given a third phosphate group, which stores energy in the bond.
The coat that surrounds the genetic material of a virus is made of what material?
protein
Distinguish between the lytic and lysogenic cycles of viruses.
The viral genome incorporates into the host genome during the lysogenic cycle.
Why are common cold viruses difficult to cure?
The viral genome mutates very quickly.
Invertebrates lack which organ system?
skeletal
Select two organs in the digestive system that provide only mechanical digestion of food.
- esophagus
- anus
Which body system receives a stimulus from the environment, processes it, and produces an appropriate response?
nervous
Which of these human development stages occurs last?
fetus
Which process occurs in the uterus?
a fetus grows
Which type of mutation would have the greatest impact on the inheritance of a trait?
A frameshift mutation of two bases near the beginning of the protein in a gamete.
Which lobe of the brain is MOST helpful when looking through a prism?
occipital
Identify the location within a plant cell where the light-dependent reactions of photosynthesis take place.
the thylakoid membrane of the chloroplast