Search Results

Search Results

Refine this search

2,902 results

Image

from article Allosteric enzyme

Result thumbnail
Model of an allosteric enzyme composed of two subunit monomers. Regulatory effects are obtained by shifting back and forth between the two states—relaxed (R state) and taut (T state). In the R state, the enzyme reacts with substrate and activators;…

Image

from article Heart (invertebrate)

Result thumbnail
Invertebrate hearts range from (left) the centralized hearts and open circulatory systems of grasshoppers to (right) the distributed hearts and closed circulatory systems of segmented worms. (Copyright © McGraw-Hill Education)

Image

from article Heart (invertebrate)

Result thumbnail
Circulatory system in a marine snail (Aplysia). Arrows indicate the normal direction of blood flow. (Credit: E. Mayeri, J. Koester, I. Kupfermann, G. Liebeswar, and E. R. Kandel)

Image

from article Heart (invertebrate)

Result thumbnail
Cardiac ganglion of a lobster (Homarus): (a) nerves on the inner dorsal surface of the heart; (b) cell body position of all nine intrinsic neurons. (Credit: D. K. Hartline)

Image

from article Heart (invertebrate)

Result thumbnail
Cross section of a leech (Hirudo), showing its major organs and muscles, including its ventral nerve cord and the four longitudinal coelomic sinuses, which are the main vessels of its circulatory system. The nerve cord is enclosed in the ventral…

Image

from article Amino acid

Result thumbnail
Structural formula for an amino acid. (Copyright © McGraw Hill)

Image

from article Amino acid

Result thumbnail
The 20 amino acids that serve as the building blocks for proteins. These amino acids (shown with their respective three-letter abbreviations) can be divided into nonpolar, polar, and electrically charged groups. (Copyright © McGraw Hill)

Image

from article Amino acid

Result thumbnail
Synthesis of a dipeptide. When an amino group of one amino acid is linked to the carboxyl group of another amino acid, a peptide bond linkage is formed. A molecule of water (H2O) is split out when a peptide bond is formed. (Copyright © McGraw Hill)

Image

from article Amino acid

Result thumbnail
Two-dimensional chromatogram of a protein. (Credit: R. J. Block, E. L. Durrum, and G. Zweig)

Image

from article Mitochondrial replacement therapy

Result thumbnail
Spindle transfer involves the excision of the metaphase II spindle from a donor egg and replacing it with the metaphase II spindle from the affected egg. The metaphase II spindle contains the condensed chromosomes of the egg's haploid genome. Terms:…

Learn more about AccessScience

a female college student looking at the screen of her silver-cased laptop computer
Watch the YouTube video

flyer thumbnail

Download the flyerGet Adobe Acrobat Reader pdf icon