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Razan K

Numerade Educator

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Numerade tutor for 4 years
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Razan's Quick Ask Videos

01:54
Chemistry 101

A measured amount of HBr gas was added to pure water at 25°C and obtained a solution with [H3O+] = 4.2x10–9 M.
Calculate [OH–].
Is the solution neutral, acidic, or basic?
Calculate the pH of the solution.
04:01
Physics 101 Mechanics

A plane takes off from an airport and flies to town A,
located
d1 = 210 km
from the airport in the direction 20.0° north of east. The plane
then flies to town B, located
d2 = 235 km
at 30.0° west of north from town A. Use graphical methods to
determine the distance and direction from town B to the airport.
(Enter the distance in km and the direction in degrees south of
west.)
04:59
Intro Stats / AP Statistics

An elevator has a placard stating that the maximum capacity is 2445 lb—15 passengers. So, 15 adult male passengers can have a mean weight of up to 2445/15 = 163 pounds. If the elevator is loaded with 15 adult male passengers, find the probability that it is overloaded because they have a mean weight greater than 163 lb. (Assume that weights of males are normally distributed with a mean of 166 lb and a standard deviation of 33 lb.) Does this elevator appear to be safe?
02:53
Biology

Tight junctions serve two functions: binding to one another and allowing small ions to flow from cell to cell. They also create a semipermeable barrier between epithelial cells, facilitating paracellular transport. Additionally, tight junctions maintain the separation of the apical and basolateral membranes and form a tight seal between epithelial cells.

Nuclear localization signals consist of regions of hydrophobic amino acids that bind to nuclear import receptors in the cytosol. None of the answers provided are correct. Hydrophilic amino acids bind to signal recognition particles, while positively charged amino acids within a protein sequence bind to nuclear import receptors. Negatively charged amino acids within a protein sequence bind to nucleoporins.
05:59
Chemistry 101

which of the following species are capable of hydrogen bonding among themselves H2S, C6H6, CH3OH
07:02
Biology

1. In an aquatic community, a food web as illustrated below may
exist. Each arrow leads from an organism that is consumed by
another one.
2. Identify the nutrients and energy flow in the
image above. Label the following:
Autotrophs
Producers
Tertiary consumers
Heterotrophs
Primary consumers
Decomposers
Secondary consumer
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