Finch beaks don't grow or shrink much once the finch reaches maturity. What is responsible for the average beak size changing from year to year?
a) Different people were measuring the beaks and there was some error made.
b) The average is made up from measures of many birds.
c) Experimenter bias may have resulted in the change.
d) More large birds were born each year than small birds.
e) Beak size remains constant and doesn't change.
Ans: b) The average is made up from measures of many birds.
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Centrioles, cilia, flagella, and basal bodies have remarkably similar structural elements and arrangements. Which of the following hypotheses is most plausible in light of such structural similarities?
A) Cilia and flagella arise from centrioles. B) Loss of basal bodies should prevent cells from dividing in two. C) Motor proteins such as dynein must have evolved before any of these four kinds of structure. D) Cilia and flagella evolved separately in the same ancestral eukaryotic organism. E) Natural selection for cell motility repeatedly selected for microtubular arrays in circular patterns in the evolution of each of these structures.
____ are molecules with identical chemical formulas but different three-dimensional structures
What is the answer to this?
Which of the following statements is false?
a. Crossing over tends to reduce the frequency that two linked genes are inherited together. b. Independent assortment of homologous chromosomes during meiosis increases variation. c. Crossing over leads to variation. d. An abnormal number or structure of chromosomes may influence the course of evolution. e. The closer together genes are found on a chromosome, the greater the chance that crossing over will occur between them.
The pyrimidine bases in DNA are
a. adenine and guanine. b. adenine and cytosine. c. cytosine and thymidine. d. cytosine and guanine.