which of the following organelles is an internal membrane system where lipid components of cell membrane are made?
b. Endoplasmic reticulum
Small particles of RNA and protein on which proteins are assembled are called _____?
c. Ribosomes
The ____ of a cell holds genetic information (DNA) in a double membrane.
b. Nucleus
_____ are filled with enzymes used to break down carbohydrates into smaller molecules.
d. Lysosomes
The ___ supports the cell and provides a barrier to the outside environment.
a. Cell membrane
_____ are involved in spindle formation in cell division.
b. Centrioles
Small hair-like extensions that allow movement are called ____.
a. Cilia
Which of the following organelles is a stack of membranes that modifies, sorts, and packages proteins and other materials for storage or release?
c. Golgi apparatus
Saclike structure that store materials are called ____.
d. Vacuoles
All of the following cell parts and organelles are found in both animal and plant cells except _____.
c. Cell wall
All of the following are parts of the cell theory except ____.
b. All matter is composed of cells.
Prokaryotic cells have all of the following characteristics expect ____.
d. Nucleus
_____ cells are larger, more complex and contain membrane-bound DNA.
a. Eukaryotic
Three structures that are unique to plant cells and not animal cells are chloroplasts, large vacuole(s), and _____.
b. Cell wall
Which of the following shows the correct flowchart of the hierarchy of living things. (Smallest�->largest)
c. Atoms�->molecules�->cells�->tissues�->organs�->organ systems
All of the following are functions of proteins in the cell membrane expect _____.
b. Provides flexibility
_____ in the cell membrane provides flexibility and keeps the membrane from freezing.
d. Cholesterol
The ____ molecule makes up the majority of the cell membrane.
b. Phospholipid
Which part of the phospholipid molecule is hydrophobic?
Tail
Which part of the phospholipid molecule is polar?
Head
A(n) ____ bond is formed by the sharing of electrons.
a. Covalent
Two or more different atoms are combined in definite proportions in any ____.
a. Compound
A compound that produces hydrogen ions in solution is a(n) _____.
a. Acid
Proteins are polymers formed from ____.
a. Amino acids
An enzyme speeds up a reaction by _____ the activation energy.
b. Decreasing
In a chemical reaction, a reactant bunds to an enzyme at a region known as the ____.
d. Active site
The process by which organisms keep their internal conditions relatively stable is called _____.
c. Homeostasis
The process by which two cells from different parents unite to produce the first cell of a new organism is called _____.
d. Sexual reproduction
A scientific ____ is a well-tester explanation that unifies a broad range of observations.
b. Theory
The statement "The worm is 2 cm long" is a(n) _____.
c. Observation
To be useful in science, a hypothesis must be _____.
d. Testable
A(n) ____ is a logical interpretation of an observation.
c. Inference
A(n) ____ is a group of similar cells that performs a particular function.
b. Tissue
A group of organs that's work together to preform a specific function is called a(n) _____.
d. Organ system
A group of tissues work together as a(n) _____.
c. Organ
____ pressure is caused by force from the net movement of water out of and into a cell.
c. Osmotic
_____ are proteins in the cell membrane that allow water to pass through them.
a. Aquaporins
The passive transport process in which molecules move through special protein channels in the cell membrane is called _____.
d. Facilitated