The part of a mollusc's body that is responsible for secreting a shell is the:
a. mantle
b. nephridium.
c. head-foot region.
d. visceral.
a
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In flowering plants, a mature male gametophyte contains _____
A) two haploid gametes and a diploid pollen grain B) a generative cell and a tube cell C) two sperm nuclei and one tube cell nucleus D) two haploid microspores E) a haploid nucleus and a diploid pollen wall
The human leukocyte antigen genes are on the
A) short arm of chromosome 6. B) long arm of chromosome 18. C) short arm of chromosome 2. D) long arm of chromosome 6.
What are on the surface of most vertebrate cells, acting as markers of "self"?
A. major histocompatibility complex proteins B. T-cell receptors C. antigens D. immunoglobulins
Humans can survive on Earth without biodiversity.
Indicate whether the statement is true or false.