Which of these organisms exhibit semelparity?
a. guppies
b. shark
c. bamboo
d. antelope
c. bamboo
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At the molecular level, the "choice" between lytic and lysogenic pathways is determined by:
A. the positive regulatory effects of a large number of bacteriophage proteins produced soon after infection. B. the negative regulatory effects of a large number of bacteriophage proteins produced soon after infection. C. the positive regulatory effects of a small number of bacteriophage proteins produced soon after infection. D. the negative regulatory effects of a small number of bacteriophage proteins produced soon after infection. E. the positive and negative regulatory effects of a small number of bacteriophage proteins produced soon after infection.
The sharp reduction of the gene pool and the
numbers of a population through a severe epidemic is an example of a. natural selection. b. genetic isolation. c. the bottleneck effect. d. the founder effect. e. all of these.
The following mRNA transcript would result in which polypeptide sequence?5?-ACU UUC ACU AUG UUU UUA UCC UCC ACU CCU UGA-3?Use the following codons and the amino acids they encode.AUG = Start or Met; UUU, UUC = Phe; UUA, UUG = Leu; UCU, UCC = Ser; CCU, CCC = Pro; ACU, ACC = Thr; UGA = Stop.
A. Thr-Phe-Thr B. Met-Phe-Leu-Ser-Ser-Thr-Pro C. Thr-Phe-Thr-Phe-Leu-Ser-Ser-Thr-Pro D. Phe-Leu-Ser-Ser-Thr-Pro E. Met-Phe-Leu-Ser-Ser
What is the specific site of blood cell formation?
a. heart b. blood vessel walls c. red bone marrow d. compact bone e. yellow bone marrow