Which of the following statements about steroid hormones is NOT true?
A. The hormone-receptor complex can bind to chromatin.
B. Estrogen is a steroid hormone.
C. Steroid hormones act faster than non-steroid (peptide) hormones.
D. The hormone-receptor complex can enter the nucleus.
E. Steroid hormones do not bind to cell surface receptors.
Answer: C
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Chemical reactions involving ________ have been proposed as energy-yielding reactions for primitive organisms
A) Fe, O2, and H2 B) S, O2, and H2 C) S, and O2 D) S, and H2
Why is a pyramid of numbers for a forest sometimes narrow at the bottom?
a. Energy decreases as it passes through each trophic level. b. Energy increases as it passes through each trophic level. c. Individual producers are small and very numerous. d. Herbivorous insects vastly outnumber large producers. e. Large producers vastly outnumber insects.
If herbivores eat 1000 kcal of plant energy, approximately how much energy will be converted into the tissues of herbivores?
A) 1 kcal B) 10 kcal C) 100 kcal D) 1000 kcal
The fossil record is often incomplete, simply because scientists will never be able to discover some of the fossils that are buried deep in the Earth.
a. true b. false