Which of the following organisms could result from a developing embryo where the mouth
develops second?
a. earthworm
b. clam
c. beetle
d. starfish
D
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In specialized transduction, as exemplified by lambda phage in E. coli, transduction occurs at high efficiency for only a restricted group of genes near the insertion site of lambda
Indicate whether the statement is true or false.
Prior to the Mesozoic Era, the primary photosynthesizers in the ocean were the cyanobacteria and the diatoms
A. true B. false
How many rounds of cell division occur in mitosis?
a. 0 b. 1 c. 2 d.3
In humans, the _________ determines the sex of the offspring because __________.
A. male ... the sperm can fertilize either a female egg or a male egg B. female ... only the female has two functional sex chromosome C. male ... the male can contribute either an X or a Y chromosome D. chromosome contribution from both parents ... the offspring uses all the parents' chromosomes