E are _______ major families of RNA containing viruses that infect vertebrates
A.
2
B.
5
C.
7
D.
13
D
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Horizontal gene transfer
A) is rare and only occurs between closely related strains. B) is common and may sometime occur between unrelated organisms. C) does not provide an advantage to organisms. D) only occurs in prokaryotes.
A volcanic eruption carves the island into two populations (A1 and A2, 50,000 individuals each). The rodents cannot cross the lava even when it has cooled
Immediately after the eruption you take 100 individuals from each of populations A1 and A2, and sequence the same 100 base-pair gene region in the mitochondrial DNA (mtDNA) of each individual. You are shown a DNA sequence chosen at random from the total pool of 200 sequences; can you tell which population, A1 or A2, it comes from? A. yes B. no
What is a chain of round bacteria called?
a. bacilli b. spirilla c. diplococci d. streptococci e. streptobacilli
The generative cell of male angiosperm gametophytes is haploid. This cell divides to produce two haploid sperm cells. What type of cell division does the generative cell undergo to produce these sperm cells?
A) mitosis B) meiosis C) mitosis without subsequent cytokinesis D) meiosis without subsequent cytokinesis