Which group of organisms display radial cleavage during development?
a. annelids
b. mollusks
c. cnidarians
d. arthropods
e. echinoderms
e
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In vertebrate animals, spermatogenesis and oogenesis differ in that _____
A) oogenesis begins at the onset of sexual maturity, whereas spermatogenesis begins during embryonic development B) oogenesis produces four functional haploid cells, whereas spermatogenesis produces only one functional spermatozoon C) cytokinesis is unequal in oogenesis, whereas it is equal in spermatogenesis D) oogenesis ends at menopause, whereas spermatogenesis is finished before birth E) spermatogenesis is not completed until after fertilization occurs, but oogenesis is completed by the time a girl is born
Mitochondria are thought to have evolved from ancient bacteria. Which characteristics of a free-living bacteria have mitochondria lost over time?
A) an independent genome B) ribosomes C) phospholipid membranes D) motility E) ribosomes, phospholipid membranes, motility, and an independent genome
Which ovarian hormone prepares the uterus for a potential pregnancy?
a. GnRH b. estrogen c. progesterone d. FSH e. LH
Which control method would not be a suitable choice for killing Mycobacteria in a capped culture tube?
A. ultraviolet (germicidal) light B. gamma rays C. 160°C for 2 hours D. 121°C at 15 psi for 15 minutes E. All of these choices are correct.