Reptiles, birds, and insects excrete nitrogenous wastes in the form of
A. uric acid.
B. urine.
C. urea.
D. ammonia.
Answer: A
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Chromatin consists of ____
a. only DNA b. DNA and RNA c. RNA only d. DNA and associated proteins e. proteins only in the nucleus
The diagram shows genetic variation being generated via chromatid crossover. Where can crossover occur?
a. at the synaptonemal complex
b. at kinetochores
c. at recombination nodules
d. between sister chromatids
The _____ includes all of the water on earth
a. abiotic environment b. biotic environment c. hydrosphere d. lithosphere e. atmosphere
What is the composition of the "halves" of an individual peanut, which constitute the largest part of the seed, and are called cotyledons?
a) triploid endosperm cells b) haploid endosperm cells c) diploid embryo sporophyte cells d) diploid maternal sporophyte cells e) diploid gametophyte cells