A holdfast is a root-like structure that anchors aquatic sessile organisms, such as seaweed, other sessile algae, stalked crinoids, benthic cnidarians, and sponges, to the substrate.
Only 1 to 2% of the sunlight reaching the earth is used by the plants to make sugars.
The sunlight that reaches the plants are distributed in many ways. Some of the sunlight are reflected by the green leaf, some are absorbed by the structural and non chlorophyll cells and only a small fraction of the sunlight is actually used to carry out photosynthesis.
Answer:
was caused by global warming that left ocean animals unable to breathe. The largest extinction in Earth's history marked the end of the Permian period, some 252 million years ago
Explanation:
Answer:
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Explanation:
a.- Tertiary
b.-
A.- α-Helix
C.- Disulfide bridge
D.- Hydrogen bonding
E .- Hydrophobic interaction
B.- Ionic bond
20.-
2.- α-Helix and β pleated sheets
4.- Collagen and hemoglobin
1.- Determined by the sequence of DNA bases
2.- Form stabilized by hydrogen bonds
3.- Form stabilized by hydrogen bonds, ionic bonds, hydrophobic interactions and disulfide bridges.
4.- Globular proteins
4.- Interaction among several polypeptide chains
3.- Many enzymes
2.-Regular, repeated folding of the peptide chain
1.- Sequence of aminoacids in a protein
