For some proteins, small molecules are integral to their structure and function. Enzymes can synthesize some of these small molecules, whereas others, called vitamins, must be ingested in the food we eat
Which of the following molecules is not classified as a vitamin but does require the ingestion of a vitamin for its production?
(a) retinal
(b) biotin
(c) zinc
(d) heme
(a)
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When a crossover occurs within the inversion loop of a pericentric inversion, each recombinant chromatid will have (Select all that apply.)
A) a dicentric bridge. B) a duplication of some genes in the inverted region. C) a deletion of some genes in the inverted region. D) one copy of each gene, with some genes in a different order than normal. E) one copy of each gene in the normal order.
True or False: To transcribe something is to make an identical copy, i.e., if the original is DNA, the transcribed copy is also DNA.
Answer the following statement true (T) or false (F)
A chromosome ____
a. consists of DNA and its associated proteins b. is a single stranded DNA molecule c. anchors the DNA within the nucleus d. stabilizes the nuclear membrane e. is found within the nucleus and cytoplasm
____ are used to allow gas exchange in leaves whereas _____ are used to maximize water uptake in roots
A. stomata, root hairs B. xylem, root hairs C. stomata, phloem D. trichomes, xylem