From the sequencing of the human genome, we believe that there are approximately 21,000 protein-coding genes in the genome, of which 1500–3000 are transcription factors
If every gene has a tissue-specific and signal-dependent transcription pattern, how can such a small number of transcriptional regulatory proteins generate a much larger set of transcriptional patterns?
Transcription regulators are generally used in combinations, thereby increasing the possible regulatory repertoire of gene expression with a limited number of proteins.
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Which of the following is a function of the glands indicated by “A”?
1.secretes calcitonin
2.secretes thyroid releasing hormone
3.secretes iodine-containing molecules
4.secretes parathyroid hormone
The metabolic process ____________________ converts pyruvate to lactic acid. Fill in the blank(s) with the appropriate word(s)
Which of these pathways best summarizes the route of a mineral that is absorbed by a plant?
A) Root hairs ? epidermis ? cortex ? endodermis ? pericycle ? xylem B) Root hairs ? pericycle ? endodermis ? endodermis ? cortex ? xylem C) Root hairs ? endodermis ? cortex ? pericycle ? xylem D) Root hairs ? epidermis ? endodermis ? cortex ? xylem E) Root hairs ? cortex ? epidermis ? phloem ? xylem
All bacterial cells have
A) Fimbriae B) Capsules C) A chromosome D) Flagella E) Endospores