Why are chromosomes not always visible?

a.

They are often very loosely coiled in strands of chromatin

b.

They are wound very tightly

c.

They lose pigment in sunlight

d.

They are often behind the nuclear envelope

Which of the following is considered a true medical emergency due to the high risk of blindness that may occur if not immediately corrected? A. retinal detachment B. macular degeneration C. diabetic retinopathy D. cataract

Nearly one billion dollars a year are spent on clearing sediment from streams and lakes in the United States. Which is the most common source of this sediment? A. productive farmland that is over-irrigated B.

Which of the following characteristics do bryophytes share with algae? a. non motile gametes and cell wall structure b. biflagellate motile gametes and life cycle c. biflagellate gametes and cuticle

A sentence for the word living

Nebulas are birthplaces for new stars. Group of answer choices a True b False

A rabbit is an example of a - - - while a hyena is an example of a - - - producer parasite herbivore carnivore host carnivore

Which organelle is not found in plant cells? A) vacuoles B) mitochondria C) chloroplast D) centrioles

Gina is driving her car down the street. She has a teddy bear sitting on the back seat. A dog runs in front of Gina's car, so she quickly applies the brakes.

The term enzymes, was first used in 1878. The term is derived from a Greek word that means in yeast because the yeast cells were first to reveal enzyme activity in living organisms.

The pituitary gland is controlled by sex hormones? 1. true or 2. false