Mycorrhizae are symbiotic associations between fungi and plant
A) seeds. B) stems. C) roots. D) flowers. E) leaves.
C
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Companion cells function to ________
a. form living tubes for sugar transport b. load sugar into sieve tubes c. photosynthesize and produce sugar d. transport water throughout the plant
The hierarchy of endocrine glands that control the release of sex steroid hormones is ____
a. hypothalamus, posterior pituitary, gonads b. hypothalamus, anterior pituitary, gonads c. anterior pituitary, hypothalamus, gonads d. posterior pituitary, hypothalamus, gonads e. anterior pituitary, posterior pituitary, gonads
Which is an example of a structural homology?
A. The same group of embryonic cells forms the adult jaw of a perch and of a dog. B. All vertebrate embryos form a post-anal tail. C. All organisms share a common genetic code. D. Vertebrate forelimbs have the same number and arrangement of bones.
A pregnant mouse is exposed to high levels of a chemical. Many of the mice in her litter are deformed, but when they are interbred with each other, all their offspring are normal. Which two of the following statements could explain these results?
(a) In the deformed mice, somatic cells but not germ cells were mutated. (b) The original mouse's germ cells were mutated. (c) In the deformed mice, germ cells but not somatic cells were mutated. (d) The toxic chemical affects development but is not mutagenic.