One double-stranded DNA molecule combined with proteins form ____________________, which is visible as clumps or threads in the cell nucleus

Fill in the blank(s) with correct word


chromatin

Biology & Microbiology

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Tamoxifen blocks the activity of estrogen in ____, but increases the activity of estrogen in ____

a. breast tissue; ovarian tissue b. uterine tissue; ovarian tissue c. uterine, tissue; breast tissue d. breast tissue; uterine tissue e. brain tissue; breast tissue

Biology & Microbiology

Urine cannot escape back to the ureter from the bladder because there is/are blocking the way.

a. A valve b. mucosa c. Two valves d. A flap of muscle

Biology & Microbiology

A relationship that has been established based on a large amount of observational and experimental data is a(n)

A) fact. B) assumption. C) conjecture. D) theory.

Biology & Microbiology

Which of the following statements is true about epigenetic regulation?

A) Epigenetic regulation changes the sequence of DNA nucleotides. B) Epigenetic regulation is unable to affect a cell's phenotype. C) Epigenetic regulation is completely understood. D) Epigenetic regulation is a way to control protein synthesis. E) DNA methylation is one example of epigenetic regulation that is only found in prokaryotes.

Biology & Microbiology