Why are common cold viruses difficult to cure?(1 point)
Responses
A copy of the DNA is made from the viral RNA.
A copy of the DNA is made from the viral RNA.
The virus leads to other viral infections such as the flu and HIV.
The virus leads to other viral infections such as the flu and HIV.
The viral genome mutates very quickly.
The viral genome mutates very quickly.
Vaccines prevent the development of a cure.
The viral genome mutates very quickly.
Identify the answer choice that correctly orders the types of cells from least to most differentiated.(1 point)
Responses
totipotent stem cells → pluripotent stem cells → multipotent stem cells → neuron
totipotent stem cells → pluripotent stem cells → multipotent stem cells → neuron
neuron → multipotent stem cells → pluripotent stem cells → totipotent stem cells
neuron → multipotent stem cells → pluripotent stem cells → totipotent stem cells
multipotent stem cells → totipotent stem cells → pluripotent stem cells → neuron
multipotent stem cells → totipotent stem cells → pluripotent stem cells → neuron
totipotent stem cells → multipotent stem cells → pluripotent stem cells → neuron
totipotent stem cells → pluripotent stem cells → multipotent stem cells → neuron
Why are there different types of cells?(1 point)
Responses
There are not different types of cells.
There are not different types of cells.
During mitosis, cells become specialized.
During mitosis, cells become specialized.
Gene expression is different between different specialized cells.
Gene expression is different between different specialized cells.
Different types of cells have different chromosomes in them.
Gene expression is different between different specialized cells.
The cells in your body often look different and perform different functions, but they all have the same(1 point)
Responses
proteins.
proteins.
mRNA.
mRNA.
DNA.
DNA.
lipids.
DNA.
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?(1 point)
Responses
a model that simply lists the steps of cell cycle
a model that simply lists the steps of cell cycle
a model that illustrates how a cell divides into two identical cells
a model that illustrates how a cell divides into two identical cells
a model that illustrates the organelles of cells
a model that illustrates the organelles of cells
a model that shows the steps of meiosis
a model that illustrates how a cell divides into two identical cells
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.
(1 point)
Responses
1, 2, and 5
1, 2, and 5
5 and 6
5 and 6
1 and 2
1 and 2
5, 6, and 7