The organelle that maintains pressure against the cell wall, so that the plant cell keeps it shape, is
the
(a) central vacuole.
(b) rough endoplasmic reticulum.
(c) smooth endoplasmic reticulum.
(d) nucleus.

Which best describes a benefit of using dna technology in medicine? a) medicine can be produced in mass quantities. b) medicine can be distributed at a reduced cost. c) medicines have fewer side effects. d) medicines are resistant to antibiotics.

In a lab, scientists grew several generations of offspring of a plant using the method shown. what conclusion can you make about the offspring? a. they formed from meiosis and mitosis. b. they have half the number of chromosomes as their parent. c. they have low genetic variability among them. d. they will be able to reproduce only after they grow flowers.

When ash and dust begin to settle on the ground, they eventually become compacted by