What feature of single nucleotides provides the energy needed for polymerization when nucleic acids are formed?
A) their methyl groups
B) their sugar groups
C) their nitrogenous bases
D) their phosphate groups
Answer: D
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If the out-of-Africa hypothesis of human origins is correct, which of the following best describes the pattern of hominin migration from Africa?
A. H. ergaster migrated 2 million years ago; H. sapiens migrated 200,000 years ago. B. H. sapiens migrated once 2 million years ago and again 200,000 years ago. C. H. ergaster migrated once 2 million years ago and again 200,000 years ago. D. H. neanderthalensis migrated once 1.3 million years ago and H. sapiens migrated 200,000 years ago. E. H. heidelbergensis migrated 2 million years ago and H. sapiens migrated 200,000 years ago.
A bride-to-be is enjoying a manicure and a facial before her hair is styled for the wedding. What organ system is being pampered?
A. lymphatic system B. integumentary system C. endocrine system D. digestive system Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about the skin, hair, and nails? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
In an unchanging environment, a well-adapted population is likely to experience no natural selection
of any kind.
Indicate whether the statement is true or false.When a certain allele at a particular gene loci has a frequency of 1.0 in a population, it is considered _____ for that population.
a) dominant b) lost c) recessive d) fixed e) balanced.