Which of the following includes some of the benefits of photosynthesis?
A. It is a source of carbon dioxide.
B. It is an oxygen source as well as a source of stored energy.
C. It stores chemical energy.
D. It enhances the greenhouse effect.
B. It is an oxygen source as well as a source of stored energy.
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Imagine that you compare two DNA sequences found in the same location on homologous chromosomes. On one of the homologs, the sequence is AACTACGA. On the other homolog, the sequence is AACTTCGA
Within a population, you discover that each of these sequences is common. These sequences _____. A) contain an SNP that may be useful for genetic mapping B) identify a protein-coding region of a gene C) cause disease D) protect against disease E) do none of the listed actions
Which of the following isnot true of the fruit fly Hedgehog (Hh) protein?
A. Hh is a member of the Wnt signaling pathway. B. Hh expression is activated by the transcription factor engrailed (en). C. Hh is secreted and interacts with Wg-producing cell receptors. D. Hh functions as a signaling molecule at segment boundaries.
Males are more often affected by sex-linked traits than females because
A) males are hemizygous for the X chromosome. B) male hormones such as testosterone often exacerbate the effects of mutations on the X chromosome. C) female hormones such as estrogen often compensate for the effects of mutations on the X. D) X chromosomes in males generally have more mutations than X chromosomes in females. E) mutations on the Y chromosome often exacerbate the effects of X-linked mutations.
The capacity of photosynthesis to convert ________ energy into ________ energy provides both a nutritional and an energy basis for all heterotrophic living things.
A) Atomic; chemical B) Solar; thermal C) Solar; chemical D) Chemical; atomic E) Chemical; solar