Which of these are enclosed by a double membrane?

A) mitochondria and chloroplasts
B) the nucleus and the Golgi apparatus
C) ribosomes and lysosomes
D) vacuoles and the rough endoplasmic reticulum
E) the smooth endoplasmic reticulum and ribosomes


A) mitochondria and chloroplasts

Biology & Microbiology

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Antidiuretic hormone makes distal tubules and collecting tubules more permeable to _____

Fill in the blank(s) with correct word

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A plant's lateral roots arise from the

a. endodermis b. epidermis c. phloem d. xylem e. pericycle

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Which phrase best describes the property of selective permeability?

A.) some molecules pass B.) all ions pass C.) large molecules pass D.) all molecules pass

Biology & Microbiology

Gram-positive cultures older than 24 hours may stain Gram negative due to changes in the peptidoglycan layer.

A) True B) False

Biology & Microbiology