Cell_structure- Human Bio

The human body consists of more than __________ trillion cells that vary considerably in shape and size.

100

Robert Hooke coined the word __________ by looking at cork.

cell

According to modern cell theory, a __________ is the basic unit of life.

cell

New cells arise from __________ cells.

preexisting

The __________ ratio is why most cells are small; it allows for more efficient nutrient and waste exchange.

surface-area-to-volume

The __________ microscope uses visible light to produce images and can magnify up to 1200 times.

compound light

Prokaryotic cells lack a __________.

nucleus

Eukaryotic cells have a nucleus that houses __________.

DNA

Facilitated transport moves molecules across the membrane from __________ concentration to __________ concentration.

higher, lower

Hypertonic solutions lead to __________ of the cell, causing it to shrivel.

crenation

Active transport requires ATP to move molecules from __________ concentration to __________ concentration.

lower, higher

Endocytosis transports molecules into the cell via __________ of the plasma membrane.

invagination

The nucleus houses __________ and associated proteins called chromatin.

DNA

The process of __________ occurs in the mitochondria and involves the production of ATP.

cellular respiration

Glycolysis is the first step of cellular respiration that occurs in the __________.

cytoplasm

Mitochondria are involved in the process of __________, converting glucose into ATP molecules.

cellular respiration

Enzymes are __________ that act as catalysts in biochemical reactions.

proteins

Facilitated diffusion involves proteins that help move substances down their __________ gradient.

concentration