Which of the following statements is true of archegonia?
A) They are the sites where male gametes are produced.
B) They may temporarily contain sporophyte embryos.
C) They are the same as sporangia.
D) They are the ancestral versions of animal gonads.
E) They are asexual reproductive structures.
Ans: B) They may temporarily contain sporophyte embryos.
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The vaccine that is stable to heat, has little unwanted material and causes minimal side effects is called a(n)
A. inactive vaccine. B. active vaccine. C. toxoid. D. peptide.
The following figure shows studies in a stream where enclosures were set up either with trout or with no trout. Which statement is a correct interpretation of the graph about trout, invertebrates, and algae?
A. If trout are present in a system, algae production is low and invertebrate population levels are also low.
B. If trout are present in a system, algae production is high and invertebrate population levels are also high.
C. If trout are present in a system, algae production is high and invertebrate population levels are low.
D. Trout do not seem to affect the algae production; only the invertebrate populations are affected.
E. Trout do affect the algae production but not the invertebrate populations.
While oncogenes are responsible for cancer cells, tumor-suppressing genes are responsible for
tumorous tissues. Indicate whether the statement is true or false.
An embryo that is composed of a hollow ball of cells is called a blastocyst
a. True b. False