What type of cell allows the immune system to respond more quickly if the same antigen is encountered a second time? A) leukocytes B) memory cells C) macrophages D) neutrophils E) natural killer cells What are the two major components of adaptive immunity?
There are primarily two types of sexes. These types of sexes include the female and the males; however, in some cases, it's hard to determine whether an individual is a male or a female. Such an individual is referred to as hermaphrodite....
This enables the separation of sister chromatids or homologouschromosomes to opposite poles of the cell during nuclear division;2. Telomeresa. Telomeres are the ends of linear eukaryotic chromosomes;b. At one of the two ends of chromosomes, there is a single-stranded 3'overhang which folds back...
TheNaturepaper appears alongside another study on neural diversity by researchers from New York University. Together the two papers provide new insight into the processes involved in producing the wide range of nerve cells found in the brains of flies. For their study, Bayraktar and Doe zeroed in...
Types of Eclipse : There are two types of eclipses . They are (a) Solar eclipse (b) Lunar eclipse (a) Solar eclipse : When the shadow of moon falls on the earth , we cannot see the sun . Is called solar eclipse . Solar eclipse occure only on new
The insertions and deletions are the type of mutations and are the two types of mutations called frame-shift. Addition or deletion of nucleotides is not a multiple of 3 will cause a change of reading frame of the genetic code. Insertionsadd one or more extra nucleotides into the DNA. An ...
One of the things that makes it challenging to study aging in laboratory models is that mice take two years to develop to an age that's equivalent to 65–70 years in people, making experiments a lengthy and resource-intensive proposition. ...
flowering stages before pollination. In this study, we focused on two objectives: (1) characterizing the variations in sexual dimorphism among the different flowering stages and (2) determining the reproductive costs of sexual dimorphism. Material and methods...
21 Using STGD1-derived photoreceptor precursor cells (PPCs), we recently showed that two intronic variants in ABCA4 (c.4539+2001G>A and c.4539+2028C>T) strengthen exonic splice enhancer elements (ESEs), resulting in the inclusion of a 345-nt PE.22 PE inclusions due to deep-intronic ...
The two electrodes can be scanned past one another by a drive that moves in three dimensions. The tunneling current output from the probe is analyzed by a measuring device. Results can be displayed on a screen or plotter, showing up (in this case) the pattern of atoms on the surface of...