Replacement-level fertility requires a total
fertility rate of
a. 2.0
b. 2.1
c. 2.4
d. 2.6
e. 2.8
B
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The phenomenon through which populations of organisms change over several generations is termed
A. homeostasis. B. growth and development. C. reproduction. D. biological evolution. E. organization.
NEW: In cats, the gene for coat color is found on the X chromosome. Shown below is a mass of cells making up an early female cat embryo. The X chromosomes are shown in each cell; this embryo has one orange coat color allele (O) and one black coat color allele (B). Which of the following is ACCURATE about this embryo?
A. It will give rise to a calico cat.
B. It will give rise to a black cat, because black is dominant to orange.
C. It will give rise to an orange cat, as the paternal chromosomes carrying the black allele will be inactivated.
D. Since it is heterozygous, it will give rise to a cat with two Barr bodies in each cell.
E. Since it is heterozygous, it will give rise to a calico cat with two Barr bodies in each cell.
The splicing regulatory protein (SR) identifies exons to be included in mRNA. How might SR proteins regulate alternative splicing?
A) There are alternative binding regions for these proteins within each exon. B) There are alternative SR proteins in different tissues at different stages of development. C) The SR proteins lose the ability to bind to exon splice suppressors. D) The SR proteins recruit the splicing small RNAs (U1, U2,…) or unusual ones. E) The spliceosome complex can bind only to regions with bound SR proteins.
During DNA replication, ________ are 1000-2000 nucleotide long strands synthesized on the ________ strand to maintain the ________ of replication
A) primers; leading; discontinuity B) Okazaki fragments; lagging; bidirectionality C) primers, lagging; continuity D) Okazaki fragments; leading, accuracy E) Okazaki fragments; leading; semidiscontinuity