The most likely method by which the mutated CCR5 gene prevents AIDS is by
A) covering the cell membrane.
B) rupturing the nuclear membrane.
C) attacking and destroying the HIV virus particles.
D) coding for a protective protein in the cell membrane.
Answer: D
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Mendel's understanding of the inheritance of traits in peas, expressed in modern language, included: Check all that apply.
_____ parents transmit information encoded in genes. _____ each individual contains two genes for each trait. _____ not all genes are identical; alternative forms (alleles) exist. _____ each of the alleles present in an individual is discrete. _____ if a given allele is present, its effects will be seen in the individual.
Methanogens may contribute to the greenhouse effect and global warming due to methane production.
Answer the following statement true (T) or false (F)
Areas that receive heavy rainfall tend to have ____ soils, and arid regions tend to have ____ soils
a. acidic; alkaline b. pH-neutral; acidic c. alkaline; acid d. acidic; pH-neutral e. pH-neutral; alkaline
Respiration
a. is only necessary for mammals. b. in most animals involves both the circulatory and respiratory systems. c. must occur over a dry surface. d. is an anaerobic process. e. is only necessary for mammals, and must occur over a dry surface