Do we have 23 or 46 chromosomes

Scarlet (st) is recessive to wild type (st+) and sepia (se) is recessive to wild type (se+). Both genes are located on chromosome 3 in Drosophila melanogaster.

What organ is the major site for gluconeogenesis (making glucose) ?

The clonal selection theory implies that: a B cell has multiple types of antigen receptors. brothers and sisters have similar immune responses. antigens activate specific lymphocytes. the body selects which antigens it will respond to.

Characteristics that allow neurons to communicate with other body cells include:a) Relaying motor impulses from the cortex to the thalamus. b) Stimulation of "association areas" to analyze information received.

How does the carbon in grass become part of a lion? choose: The lion eats the grass Carbon from grass doesn't end up in a lion. The carbon ends up in the lion's food chain. The lion breathes in carbon given out by the plant

Most of cellular respiration take place in what

An ocean trench forms when?

The fact that a strain of yeast with a certain defective gene can use the human version of the gene to repair itself is evidence that yeast and humans

What is the difference between a meteor and a meteorite? A meteor has more mass A meteorite reaches Earth and has not burned up A meteorite orbits the sun and a meteor does not A meteorite glows

Which of these was NOT characteristic of the first cells on Earth? A) anaerobic B) prokaryotic C) single-celled D) contained organelles